For any questios that ask you to choose a physical or chemical change, how do you know if it is physical or chemical change? Justify using concepts that you have learned about physical and chemical changes.

Which of these internal feedback reactions does not need your brain? oa. your leg jumping when it is hit by a reflex hammer b. your deeper breathing when you need more oxygen c. your body temperature rising when you have an infection d. your heart beating faster when you are in danger